Thames Water Strategic Partnership (TWSP)

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In 2019, Hounslow was awarded the Thames Water Strategic Partnership (TWSP) as part of our successful bid submission in competition with several other London Boroughs.

The TWSP was a five-year programme of works running from 2020-2025 which has aimed at improving surface water management and sewer capacity across the borough using Sustainable Drainage Systems (SuDS). Nine schemes have been delivered across Hounslow which have contributed to attenuating surface water from the equivalent of 5 hectares of land.

What are SuDS?

SuDS aim to reduce surface water flooding, improve water quality, and enhance the amenity and biodiversity value of the environment. They manage or store rain water reducing the rate of it reaching roads, properties and sewers and can range from something as simple as a water butt in your garden to a raingarden by a roadside or wetland area in a park.

Your local SuDS are important because they:

  • Reduce surface water flooding
  • Improve surface water quality
  • Enhance biodiversity value of the environment
  • Improve green spaces

Find out more here: Sustainable Drainage Systems: What are they and what can I do?

Who delivered the project?

The SuDS schemes were delivered by Hounslow Council in partnership with Thames Water and Thames21 led on community engagement.

Where and why?

The locations were chosen based on a combination of flood hotspot mapping, where there are known issues with sewer capacity and surface water drainage, combined with feasibility studies that meet the criteria for funding as part of the Thames Water Strategic Partnership.


In 2019, Hounslow was awarded the Thames Water Strategic Partnership (TWSP) as part of our successful bid submission in competition with several other London Boroughs.

The TWSP was a five-year programme of works running from 2020-2025 which has aimed at improving surface water management and sewer capacity across the borough using Sustainable Drainage Systems (SuDS). Nine schemes have been delivered across Hounslow which have contributed to attenuating surface water from the equivalent of 5 hectares of land.

What are SuDS?

SuDS aim to reduce surface water flooding, improve water quality, and enhance the amenity and biodiversity value of the environment. They manage or store rain water reducing the rate of it reaching roads, properties and sewers and can range from something as simple as a water butt in your garden to a raingarden by a roadside or wetland area in a park.

Your local SuDS are important because they:

  • Reduce surface water flooding
  • Improve surface water quality
  • Enhance biodiversity value of the environment
  • Improve green spaces

Find out more here: Sustainable Drainage Systems: What are they and what can I do?

Who delivered the project?

The SuDS schemes were delivered by Hounslow Council in partnership with Thames Water and Thames21 led on community engagement.

Where and why?

The locations were chosen based on a combination of flood hotspot mapping, where there are known issues with sewer capacity and surface water drainage, combined with feasibility studies that meet the criteria for funding as part of the Thames Water Strategic Partnership.


Page last updated: 05 Nov 2025, 11:10 AM